US4873546A - Color printing method and apparatus - Google Patents

Color printing method and apparatus Download PDF

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Publication number
US4873546A
US4873546A US07/264,399 US26439988A US4873546A US 4873546 A US4873546 A US 4873546A US 26439988 A US26439988 A US 26439988A US 4873546 A US4873546 A US 4873546A
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US
United States
Prior art keywords
light
original
green
blue
intensities
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Expired - Lifetime
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US07/264,399
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English (en)
Inventor
Wolfgang Zahn
Manfred Fursich
Wilhelm Nitsch
Hans-Jurgen Rauh
Helmut Treiber
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Agfa Gevaert AG
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Agfa Gevaert AG
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Assigned to AGFA-GEVAERT AKTIENGESELLSCHAFT, LEVERKUSEN, GERMANY, A CORP. OF GERMANY reassignment AGFA-GEVAERT AKTIENGESELLSCHAFT, LEVERKUSEN, GERMANY, A CORP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FURSICH, MANFRED, NITSCH, WILHELM, RAUH, HANS-JURGEN, TREIBER, HELMUT, ZAHN, WOLFGANG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G01N21/5907—Densitometers
    • G01N21/5911—Densitometers of the scanning type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/73—Controlling exposure by variation of spectral composition, e.g. multicolor printers
    • G03B27/735—Controlling exposure by variation of spectral composition, e.g. multicolor printers in dependence upon automatic analysis of the original
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4223—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for copy - or printing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/2803—Investigating the spectrum using photoelectric array detector
    • G01J2003/2813—2D-array
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J3/14—Generating the spectrum; Monochromators using refracting elements, e.g. prisms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/2803—Investigating the spectrum using photoelectric array detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/86—Investigating moving sheets

Definitions

  • the raw intensity of the transmitted light is measured at a plurality of wavelengths in each of the ranges.
  • Each wavelength lies in a respective segment or wavelength interval of the corresponding range and each segment may be assigned a spectral sensitivity factor for the copy material.
  • the raw intensity for each segment is modified by the respective factor to obtain a corrected intensity for the segment and the corrected intensities for each range are summed to derive first, second and third sums respectively representing blue, green and red densities of the original. Calculation of the amounts of copy light is then performed using the sums.
  • One or more tables, such as that of FIG. 2b, listing the gamma values for a copy material as a function of wavelength may be store in the memory 24.
  • the gamma values may be retrieved by the computer 23 which thereupon multiplies these values by the raw intensities derived from the intensity measuring unit 11 to yield the curves 13, 14 and 15.
  • the computer 23 may thereafter integrate the curves 13, 14 and 15 to obtain the blue, green and red densities of the respective scanned region of the original and such densities may then be stored in the memory 24.
  • the light emanating from the opening in the diaphragm 27 is directed to a dichroitic beam splitting unit by means of a collimating lens 28.
  • the beam splitting unit comprises a first beam splitter 29 which reflects the blue component of the light to a focusing lens 30.
  • the focusing lens 30 forms a sharp blue image of the slit-like opening in the diaphragm 27 on a properly positioned intensity measuring unit 32 which includes a row or an array of light-sensitive cells.
  • the unit 32 may be in the form of a linear charge-coupled device.
  • the green and red components of the light issuing from the opening in the diaphragm 27 pass through the first beam splitter 29 and travel to a second dichroitic beam splitter 33.
  • the beam splitter 33 reflects the green component of the light to a focusing lens 34 which forms a sharp green image of the opening in the diaphragm 27 on a suitably arranged intensity measuring unit 36 similar to the unit 32.
  • a green filter 35 of known construction is located intermediate the focusing lens 34 and the unit 36 and adjusts the green component of the light and the spectral sensitivity of the unit 36 to the green spectral sensitivity of the copy material for the original. Again, the adjustment is only partial because the green filter 35 is designed conventionally by taking averages over different types of copy material.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Health & Medical Sciences (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Spectrometry And Color Measurement (AREA)
US07/264,399 1987-11-06 1988-10-28 Color printing method and apparatus Expired - Lifetime US4873546A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3737775A DE3737775C2 (de) 1987-11-06 1987-11-06 Verfahren und Vorrichtung zur Messung der Dichtewerte einer Kopiervorlage
DE3737775 1987-11-06

Publications (1)

Publication Number Publication Date
US4873546A true US4873546A (en) 1989-10-10

Family

ID=6339975

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/264,399 Expired - Lifetime US4873546A (en) 1987-11-06 1988-10-28 Color printing method and apparatus

Country Status (5)

Country Link
US (1) US4873546A (de)
JP (1) JP2733265B2 (de)
CH (1) CH677041A5 (de)
DE (1) DE3737775C2 (de)
IT (1) IT1229934B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990950A (en) * 1988-10-03 1991-02-05 Fuji Photo Film Co., Ltd. Photographic printing system
US5041869A (en) * 1989-09-01 1991-08-20 Gretag Systems Photoelectric scanner
US5087937A (en) * 1989-09-07 1992-02-11 Gretag Systems Photoelectric scanner
US5109251A (en) * 1989-12-13 1992-04-28 Gretag Systems, Inc. Photographic color copying apparatus
US5119125A (en) * 1990-09-10 1992-06-02 Gretag Systems, Inc. Process for the preparation of photographic color copies
US5177532A (en) * 1989-04-18 1993-01-05 Fuji Photo Film Co., Ltd. Image forming apparatus for adjusting gradation using subsidiary exposure
WO1993016456A1 (en) * 1992-02-14 1993-08-19 Brian White Creating an image as perceived by a person with color-deficient vision
US5506656A (en) * 1992-09-11 1996-04-09 Agfa-Gevaert, Ag Method of and apparatus for measuring the optical density of a photographic negative
US5561494A (en) * 1992-06-15 1996-10-01 Fuji Photo Film Co., Ltd. Method of and apparatus for determining exposure amount in copying apparatus
US6755498B2 (en) 2001-03-27 2004-06-29 Global Graphics Software Limited Establishing a reference printer state using a recursive tone scale matching
WO2013159812A1 (en) * 2012-04-24 2013-10-31 Hewlett-Packard Development Company, L.P. Printing system and method of operation
CN103411670A (zh) * 2013-06-27 2013-11-27 中国科学院光电研究院 一种新型棱镜色散成像光谱仪
US10455156B2 (en) 2016-02-29 2019-10-22 Hewlett-Packard Development Company, L.P. Using unidirectional and omnidirectional antennas to determine whether object image is in camera viewfinder

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489719B1 (de) * 1987-10-15 1994-08-03 Gretag Imaging Ag Belichtungssteuerungsverfahren für ein fotografisches Farbkopiergerät
DE3740103A1 (de) * 1987-11-26 1989-06-08 Stein Ritter Von Werner Verfahren zur steuerung der belichtung in hochleistungsprintern
US5162841A (en) * 1989-10-11 1992-11-10 Fuji Photo Film Co., Ltd. Exposure controlling apparatus
DE4212015C2 (de) * 1991-04-10 1999-07-01 Fuji Photo Film Co Ltd Verfahren zur Bestimmung der Spektralverteilung eines Films sowie zur Bestimmung der Belichtungsmenge
US5216487A (en) * 1991-05-22 1993-06-01 Site Services, Inc. Transmissive system for characterizing materials containing photoreactive constituents
JPH05134330A (ja) * 1991-11-13 1993-05-28 Fuji Photo Film Co Ltd 画像測光方法
US5303028A (en) * 1992-08-24 1994-04-12 Eastman Kodak Company Spectrometer apparatus for calibrating color imaging apparatus
DE19542239C2 (de) * 1995-11-13 1998-08-27 Agfa Gevaert Ag Verfahren und Vorrichtung zur bereichsweisen Messung der Durchlässigkeit einer fotografischen Farbkopiervorlage
DE10131934B4 (de) 2001-07-02 2010-03-11 Wifag Maschinenfabrik Ag Messung und Regelung der Farbgebung im Rollendruck
JP5009213B2 (ja) * 2008-03-31 2012-08-22 元旦ビューティ工業株式会社 外装材用取付部材、その取付構造、及び外装構造の施工方法
DE102012107046B4 (de) * 2012-08-01 2020-01-02 Deutsches Zentrum für Luft- und Raumfahrt e.V. Abbildungsvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279502A (en) * 1978-09-15 1981-07-21 Agfa-Gevaert, A.G. Method of and apparatus for determining the copying light amounts for copying from color originals
US4406538A (en) * 1980-12-23 1983-09-27 Agfa-Gevaert Aktiengesellschaft Method and arrangement for automatic exposure control in color copiers
US4589766A (en) * 1983-05-17 1986-05-20 Agfa-Gevaert Aktiengesellschaft Copying method and arrangement for colored originals

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567240A (en) * 1947-10-29 1951-09-11 Miehle Printing Press & Mfg Color facsimile system
JPS5939687B2 (ja) * 1973-07-06 1984-09-26 工業技術院長 光のスペクトラム分布を用いた柄出しのための色分解法および装置
DE2546253A1 (de) * 1975-10-13 1977-04-14 Optronik Gmbh Photoempfaenger fuer ein spektralanalyse- und farbmessgeraet mit mehreren lichtempfindlichen empfaengern
CH610673A5 (de) * 1977-02-01 1979-04-30 Gretag Ag
DE3322665A1 (de) * 1983-06-23 1985-01-03 Siemens AG, 1000 Berlin und 8000 München Farbdichtemessgeraet
US4666306A (en) * 1984-01-19 1987-05-19 Fuji Photo Film Co., Ltd. Method and apparatus for detecting photographic image information
JPS62106448A (ja) * 1985-11-05 1987-05-16 Fuji Photo Film Co Ltd 写真焼付け装置
US4676628A (en) * 1986-02-18 1987-06-30 Asbury Iii Louis H Method and apparatus for analyzing and printing color photographs
EP0489719B1 (de) * 1987-10-15 1994-08-03 Gretag Imaging Ag Belichtungssteuerungsverfahren für ein fotografisches Farbkopiergerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279502A (en) * 1978-09-15 1981-07-21 Agfa-Gevaert, A.G. Method of and apparatus for determining the copying light amounts for copying from color originals
US4406538A (en) * 1980-12-23 1983-09-27 Agfa-Gevaert Aktiengesellschaft Method and arrangement for automatic exposure control in color copiers
US4589766A (en) * 1983-05-17 1986-05-20 Agfa-Gevaert Aktiengesellschaft Copying method and arrangement for colored originals

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990950A (en) * 1988-10-03 1991-02-05 Fuji Photo Film Co., Ltd. Photographic printing system
US5177532A (en) * 1989-04-18 1993-01-05 Fuji Photo Film Co., Ltd. Image forming apparatus for adjusting gradation using subsidiary exposure
US5041869A (en) * 1989-09-01 1991-08-20 Gretag Systems Photoelectric scanner
US5087937A (en) * 1989-09-07 1992-02-11 Gretag Systems Photoelectric scanner
US5109251A (en) * 1989-12-13 1992-04-28 Gretag Systems, Inc. Photographic color copying apparatus
US5119125A (en) * 1990-09-10 1992-06-02 Gretag Systems, Inc. Process for the preparation of photographic color copies
WO1993016456A1 (en) * 1992-02-14 1993-08-19 Brian White Creating an image as perceived by a person with color-deficient vision
US5561494A (en) * 1992-06-15 1996-10-01 Fuji Photo Film Co., Ltd. Method of and apparatus for determining exposure amount in copying apparatus
US5506656A (en) * 1992-09-11 1996-04-09 Agfa-Gevaert, Ag Method of and apparatus for measuring the optical density of a photographic negative
US6755498B2 (en) 2001-03-27 2004-06-29 Global Graphics Software Limited Establishing a reference printer state using a recursive tone scale matching
WO2013159812A1 (en) * 2012-04-24 2013-10-31 Hewlett-Packard Development Company, L.P. Printing system and method of operation
US9264583B2 (en) 2012-04-24 2016-02-16 Hewlett-Packard Development Company, L.P. Printing system and method for backlit substrate calibration
US9967406B2 (en) 2012-04-24 2018-05-08 Hewlett-Packard Development Company, L.P. Printing system calibration for backlit images
EP3370407A1 (de) * 2012-04-24 2018-09-05 Hewlett-Packard Development Company, L.P. Drucksystem und verfahren zum betrieb
US10341506B2 (en) 2012-04-24 2019-07-02 Hewlett-Packard Development Company, L.P. Calibrated print data generation based on color calibration data accounting for backlight characteristics
CN103411670A (zh) * 2013-06-27 2013-11-27 中国科学院光电研究院 一种新型棱镜色散成像光谱仪
CN103411670B (zh) * 2013-06-27 2015-08-19 中国科学院光电研究院 一种新型棱镜色散成像光谱仪
US10455156B2 (en) 2016-02-29 2019-10-22 Hewlett-Packard Development Company, L.P. Using unidirectional and omnidirectional antennas to determine whether object image is in camera viewfinder

Also Published As

Publication number Publication date
JPH01142719A (ja) 1989-06-05
JP2733265B2 (ja) 1998-03-30
DE3737775A1 (de) 1989-05-18
CH677041A5 (de) 1991-03-28
IT1229934B (it) 1991-09-16
DE3737775C2 (de) 1997-05-07
IT8822338A0 (it) 1988-10-17

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